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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total net revenues	[1]	$ 913,034	$ 770,420
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues		860,132	741,230
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues		37,738	26,390
Other [Member]
Segment Reporting Information [Line Items]
Total net revenues		$ 15,164	$ 2,800
[1] No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2020 or 2019.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income after deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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